Members of the cycloalkane homologous series may not always show a single peak in Hydrogen-1 NMR spectroscopy due to molecular symmetry variations. Cyclohexane, for instance, can exhibit more than one peak because of its different conformations, such as the boat and chair forms, which have distinct symmetries. The number of peaks observed can also be influenced by temperature, as it affects the rate of interconversion between conformers relative to the NMR timescale. Relevant spectra supporting these observations can be found in linked resources.
